Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f64a5d88446e7f9…

MALICIOUS

PDF

73.9 KB Created: 2021-02-20 18:11:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 5afee62ebf1472ed97cc443e8c473589 SHA-1: 53c3699b4addc03c6eba55440023da0522a571f6 SHA-256: 7f64a5d88446e7f9b8f36f94934b4761f64bb2e029c2d8276ce314b1a4c3fef2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are SEO-themed and lead to other PDFs, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://druttle.ru/wix?keyword=lake+nona+country+club+membership+fees PDF link annotation
    • https://sirowatogiwu.weebly.com/uploads/1/3/2/8/132814809/97661e6e.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafanez/1otQxI4/17442767514.pdfIn PDF document text
    • http://idealicacolumbia.site/zodasumusebimopevefp1vyp.pdfIn PDF document text
    • https://lavabowigu.weebly.com/uploads/1/3/2/6/132682694/e14e210e2f.pdfIn PDF document text
    • https://cdn.sqhk.co/sativomofij/Bhejjhj/82539833765.pdfIn PDF document text
    • http://afracheat4.xyz/bowmasters_diamond_membership_hack_apkin8xu.pdfIn PDF document text
    • http://phtech.site/today_s_weather_report_in_telugu7zb8y.pdfIn PDF document text
    • https://cdn.sqhk.co/nilesatu/aRhjsns/ge_13867_bluetooth_plug-_in_smart_switch.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nosepevozux/calculating_interior_angles_of_polygons_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/mozilekimuruf.pdfIn PDF document text
    • http://pasufok.rf.gd/vuvefewaxajiguwared.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/pasta_sheets_in_lasagna_still_hard.pdfIn PDF document text
    • http://namutogenasokab.epizy.com/30180678811.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/sudixamozovebuf.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C2 5384 bytes
SHA-256: d594b03b26129c920d36e6d41a16d83a84e5f05064865d2fc2c0f2eb223d004d
font_01_sfnt_off0000e6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EE 10832 bytes
SHA-256: fb56f38cedd4edc26410b965346faae4aab3c0a47b8408737d208888aee954ce
font_02_sfnt_off00010c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C05 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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